I've experimented with a LOT of different taunt druid variants. Trust me, as a Hadronox tutor, this isn't good enough to make the cut. I'd much rather cut the oakheart package to run juicy psychemelon instead and even then, the 4 mana tutor card isn't good
I think the biggest target will be Gonk for whatever he does, since this seems like a synergy card for the loa.
I don't think you would want it with Hadronox because the turn it takes up is a prime spot for getting out taunts (same cost as Oaken Summons or Ironwood Golem) and Hadronox needs to be able to die, which is a bit harder when it has 14 health and the opponent doesn't want to damage it.
Too bad it's not a neutral for inner fire shenanigans. 4 mana draw a card is bad. Double health means nothing, it can be taunted, silenced, removed. Unless you're playing some grizzly + crazed alchemist bollocks.